Surface photoemission in a high-brightness electron beam radio frequency gun

被引：33

作者：

Qian, H. J. ^{[1
,2
]}

Murphy, J. B. ^{[1
]}

Shen, Y. ^{[1
]}

Tang, C. X. ^{[2
]}

Wang, X. J. ^{[1
]}

机构：

[1] Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA

[2] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2010年 / 97卷 / 25期

关键词：

MAGNESIUM; ROUGHNESS;

D O I：

10.1063/1.3531561

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report the experimental characterization of high-brightness electron beam generation from a magnesium (Mg) photocathode. Both the quantum efficiency (QE) and the thermal emittance of an Mg cathode are experimentally investigated. The measured QE similar to 0.2% is the highest reported for a metal cathode. We observed no change in the Mg cathode thermal emittance as the QE varies from 0.015% to 0.15%. The upper-limit of the thermal emittance, 0.5 mm mrad, is about 50% lower than the theoretical prediction. Our results demonstrated the feasibility of having a high QE and a low thermal emittance simultaneously for a robust metal photocathode. c 2010 American Institute of Physics. [doi:10.1063/1.3531561]

引用

页数：3

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